Open access peer-reviewed chapter
By Rômulo Dias Novaes and João Paulo Viana Leite
Submitted: November 4th 2010Reviewed: March 30th 2011Published: November 4th 2011
© 2011 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution 3.0 License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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